injectors - what brand is best?

[iluv2moan]

in the market for some largish injectors (around 1000cc) so have been doing some reading up on whats good and whats not..

was leaning towards RC injectors which i have later found out are just badged lucas ones and read on an rx7 forum that they dont atomise that well and was linked to this youtube clip

(3rd one in from left = lucas)
http://www.youtube.com/watch?v=i-MjDsXgQro&feature=related

then found this clip comparing 6 different types, again the lucas is the 3rd from the left and the bloke mentions that they are better suited to hi performance applications and turbo cars...

http://www.youtube.com/watch?v=Emnax2J4FX4&feature=related

a bit more searching and i found this article written by rc engineering themselves about injectors in general which seems to have some valid points..

http://suprasonic.org/public_html/sonictech/fuel_injectors/RCtech.html

now i know joe rekons sards are shit because his didnt atomise very well and believes they contributed to detroying a motor (maybe not high performance enough) so keen to see what other people think about that article written above, and which injectors they would recomend in the 1000cc range

[evoeata]

i had power enterprise 850cc in my 180 when i had it. easy to install and never any dramas. im sure they do 1000cc versions. they were alot cheaper at the time than the equivalent sards or nismos. think they were rebadged nippon-denso injectors

[cplagz]

injectors also depend on the head they are going into and what ECU will be controlling them (high imp vs low imp)

[datsqik]

The new style bosch injectors that go under the brand name of Injector Dynamics are the pick of the bunch depending on what ecu you have.

[180SXTCY]

Have used HKS = denso and also the 740cc sidefeeds nismos wich i think are also denso's with good results on both occasions.

[Joe]

As you mentioned, I've used Sard's and had bad luck with them... not isolated to me either, they are very hit and miss in certain sizes

My tuner has had mixed results with them also (some are hard to tune, some actually atomise well and tune up nicely.. this is in the same size too, not different sizes!).

That being said, heaps of people have had good results with them, so its really up to you.

I'm running high-flowed factory Denso's (about 800cc) and they are working really nicely for me right now.

[cplagz]

If your ECU supports low-imp injectors I'd run them. Generally big squirters are high imp though.

[iluv2moan]

ecu is EMS 8860

motor is 1jz (converted to top feed injectors) run gt30r which is expect to make around the 4-450 hp mark on pump, bit more on E85 and possibly switch to methanol at later date.

doubt id ever make over 5-550hp with the setup.

can get some used PTE (rochesters) 1000cc for about $320 which have seen about 6k km..

want to try stick to the cheaper options if possible to comply with the budget and all

[Joe]

Why are you going such big injectors if you're only ever going to make 500-550HP at the most?

Surely you can get away with smaller ones, especially on a 6 cyl?

I reckon its silly to "over-inject" any car, it just creates driveability and tuning headaches.

[1JZNOSHIT]

Ballsac, the issue with Sards, is that specific to Dakdaks? I too heard the same but it seemed to only be an issue with EJs. Lots of Toyo guys use Sards without dramas.

[Joe]

Yeah it may be that its more prevalent in dak daks. Can't be sure, but it seems like it.

Same goes for PE injectors, hit and miss with the dak daks.

Only injectors that seem to work really well in them are Denso's.

[Skitzo]

While we are here, to further my knowledge, could someone inform me what the differece between the sizes are, or say, what 550cc means?

I know that the larger the number the higher they are rated, and am guessing they are able to flow more fuel.

[cplagz]

That's exactly what it means. cc/minute of fuel.

[Lonewolf]

550cc is the flow rate in cc/min (you will see americans use lb/min), basically how much fuel they can flow at 100% duty cycle at a certain pressure.

Bumping up fuel pressure can increase this slightly too.

[iluv2moan]

Why are you going such big injectors if you're only ever going to make 500-550HP at the most?

Surely you can get away with smaller ones, especially on a 6 cyl?

I reckon its silly to "over-inject" any car, it just creates driveability and tuning headaches.

450 hp was about 95% duty on my 550cc on my 7m.... and both e85 and methanol burn alot more fuel to make the same kind of power as pump.

new injectors will be for track supra

[iluv2moan]

550cc is the flow rate in cc/min (you will see americans use lb/min), basically how much fuel they can flow at 100% duty cycle at a certain pressure.

Bumping up fuel pressure can increase this slightly too.

u sure its at 100% duty?

[Lonewolf]

i believe so, for the ratings anyway.
If they actually flow that much at 100% is a different matter, once they go static i'd say its hit and miss.

[Skitzo]

cheers

[cplagz]

Where you gonna buy E85 from in WA out of interest. I didn't realise it was readily available.

[iluv2moan]

neither is vp or sunoco race fuels but u can get it

[cplagz]

Right. E85 needs a pretty hardcore ignition system too from what I've read. Guilt-toy or whatever is running it in his R33 Skyline.

[zeroyon]

don;t you hate living in backwards WA some times. Even SA has E85.


For the SA boys, the Liberty on tapleys hill rd seaton has E85 at the pump, 99.9c

Stolen from SAU.

[S133LTR]

And its 'cheap'!!

[Fryman]

off memory the sards and hks are rebadged nippon denso items anyway!

LOL HKS dont even make their own boxes for 1000cc injectors, and they are nippon denso.. nor have they changed the design or done anything to justify the hks premium... but thats ok!

[x17x]

go for denso...

[datsqik]

Have a read of this, i have seen the 2000cc items with perfect idle on a 2jz.
http://www.injectordynamics.com/

[iluv2moan]

Have a read of this, i have seen the 2000cc items with perfect idle on a 2jz.
http://www.injectordynamics.com/

had a look on that sote before - do they make low impedance peek and hold injectors?

[iluv2moan]

not sure if anyoen has read that 3rd link... but the reason why i posted this thread to begin with was so that people could discuss the view outlined in the article

to highlight the main one...

are more direct spray patten (hose/stream) injectors better suited to high performance applications compared to a highly atomised spray which is best suited to daily drivers...

RC engineering reasoning is in the link provided

[cplagz]

Depends on the angle the injectors are in the head and how they hit the valves as well.